She certainly looks like one to me.
Her smooshy little nose is more an indicator than anything else. If she only had the underbite, it wouldn't be my feeling that she was, but her overall build makes me think so.
I am guessing she will not get a lot bigger, and only get thicker looking. That seems to be a trend with that type of dwarf. Again, as previously stated, she will probably have a very good life with her minimal symptoms.
This is just my uneducated opinion, so I could very well be wrong. I'd love to see how she develops, if you would consider sharing.
Good luck!
Liz